tests/tso: Create independent clients to prevent interfering with other tests.

[HuSharp]

What problem does this PR solve?

Issue Number: Ref #8103

What is changed and how does it work?

tests/tso: Create independent clients to prevent interfering with other tests.

Check List

Tests

• Integration test

Release note

None.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 77.62%. Comparing base (a766351) to head (a727a0d).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #8546      +/-   ##
==========================================
+ Coverage   77.56%   77.62%   +0.05%     
==========================================
  Files         474      474              
  Lines       61861    61861              
==========================================
+ Hits        47981    48017      +36     
+ Misses      10347    10304      -43     
- Partials     3533     3540       +7     

Flag	Coverage Δ
unittests	77.62% <ø> (+0.05%)	⬆️

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[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: lhy1024, okJiang

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• OWNERS [lhy1024]

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-08-20 03:12:12.261088166 +0000 UTC m=+235127.395538280: ☑️ agreed by lhy1024.
• 2024-08-20 07:36:00.530847971 +0000 UTC m=+250955.665298092: ☑️ agreed by okJiang.